Which of the following systems of periodic tasks are schedulable by the rate-monotonic algorithm? By the earliest-deadline-first algorithm? Explain your answer. (Numbers are of form (Period, Computation Time))

(a) T = {(10, 4), (16, 4), (20, 4)}

(b) T = {(5, 2), (10, 3), (12, 3)}

(c) T = {(7, 3), (9, 5), (15,3)}